2556501 has 4 divisors (see below), whose sum is σ = 3408672. Its totient is φ = 1704332.

The previous prime is 2556493. The next prime is 2556503. The reversal of 2556501 is 1056552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2556501 - 2³ = 2556493 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426081 + ... + 426086.

It is an arithmetic number, because the mean of its divisors is an integer number (852168).

2^2556501 is an apocalyptic number.

It is an amenable number.

2556501 is a deficient number, since it is larger than the sum of its proper divisors (852171).

2556501 is an equidigital number, since it uses as much as digits as its factorization.

2556501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852170.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 2556501 is about 1598.9061886177. The cubic root of 2556501 is about 136.7357222565.

The spelling of 2556501 in words is "two million, five hundred fifty-six thousand, five hundred one".